Helmut Zemo, Mastermind 

Legendary Creature — Human Noble Villain
$0.22 #17532 0.24 0.3 years
Whenever Helmut Zemo attacks, you may cast target instant or sorcery card with mana value less than or equal to his power from your graveyard. If that spell would be put into your graveyard, exile it instead. If you cast a spell this way, put a +1/+1 counter on Helmut Zemo.
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Cards similar to Helmut Zemo, Mastermind expected a card that isn't here?
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Dreadhorde Arcanist92%
$0.58↑#8077↑0.207.5 years↑
"Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Diviner of Mist90%
$0.23↑#8652↑0.141.5 years↑
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Goblin Dark-Dwellers86%
$0.26↑#8983↑0.2710.7 years↑
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Daring Waverider86%
$0.20↓#9187↑0.322.2 years↑
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Ogre Battlecaster84%
$0.22#24987↓0.253.9 years↑
"Whenever this creature attacks, you may cast target instant or sorcery card from your graveyard by paying 
in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Kess, Dissident Mage81%
$3.67↑#3198↑0.44↑9.2 years↑
"Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."
Seifer Almasy80%
$0.28↑#10454↑0.321.4 years↑
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Efreet Flamepainter79%
$0.26↑#157960.00↓5.5 years↑
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Mavinda, Students' Advocate78%
$0.51↑#10539↑0.155.5 years↑
"
: You may cast target instant or sorcery card from your graveyard this turn. If that spell doesn't target a creature you control, it costs
more to cast this way. If that spell would be put into your graveyard, exile it instead. Activate only once each turn."
Chandra, Acolyte of Flame78%
$0.65↑#5858↑0.177.3 years↑
"−2: You may cast target instant or sorcery card with mana value 3 or less from your graveyard. If that spell would be put into your graveyard, exile it instead."
The Dawning Archaic77%
$1.01↑#8044↑0.280.5 years
"Whenever this card attacks, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Bilbo, Thief in the Night77%
$6.07↑#9182↑0.44↑0.2 years
"Whenever this card attacks, you may cast an artifact, instant, or sorcery spell from your graveyard. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead."
Arcane Proxy76%
$0.42↑#166070.06↓3.9 years↑
"When this creature enters, if you cast it, exile target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost."
Wishing Well76%
$0.28↑#11468↑0.11↓2.2 years↑
"
: Put a coin counter on this artifact. When you do, you may cast target instant or sorcery card with mana value equal to the number of coin counters on this artifact from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Activate only as a sorcery."
Victor Timely, Wily Tycoon75%
$0.27↑#26739↓0.13↓0.3 years
"When this card enters, you may cast target artifact, instant, or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Kylox's Voltstrider73%
$0.21↓#23110↓0.242.7 years↑
"Whenever this Vehicle attacks, you may cast an instant or sorcery spell from among cards exiled with it. If that spell would be put into a graveyard, put it on the bottom of its owner's library instead."
Sword of Once and Future73%
$4.95↑#4872↑0.71↑3.5 years↑
"Whenever equipped creature deals combat damage to a player, surveil 2. Then you may cast an instant or sorcery spell with mana value 2 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Gale, Waterdeep Prodigy72%
$0.31↑#5034↑0.154.4 years↑
"Whenever you cast an instant or sorcery spell from your hand, you may cast up to one target card of the other type from your graveyard. If a spell cast from your graveyard this way would be put into your graveyard, exile it instead."
Scholar of the Lost Trove72%
$0.36↑#9567↑0.336.3 years↑
"When this creature enters, you may cast target instant, sorcery, or artifact card from your graveyard without paying its mana cost. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead."